Estimation of mean skin temperature by thermography was seemed to be the most efficient method of those had ever carried out. The method, however, still included the error that would be yielded from the transformation by shadowing three-dimensional body to a plane and so on.
In this paper, small each body surface area devided on the trunk was measured on the thermograms and also on the photographs which were both taken from two directions, front and back, and from five directions, front, front 45°, side, back 45°, and back, respectively, and that was compared with the area which was taken directly on the same subject by gypsum method. Examining the amount of the transformation of the body surface area by thermography and by photography, the effects of those upon evaluation of the mean skin temperature were investigated in the case of the trunk.
As a result, it was found that the estimation errors of the body surface area were apparently increased more in thermogram than in photograph and more in using two direction's thermograms than in using five direction's ones, but the mean skin temperature of the trunk calculated from those data changed only less than ± 1% (± 0.2°C), so that the error was almost negligible in the case of the trunk.
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